RE: [Histonet] Glucose oxidase
|From:||"Veronique Andriessen" |
Thanks for your suggestions Phil, but I've tried all that.
I made the solution fresh and added the GLUOX to the buffer just before
putting it in the 37C water bath. I also tried omitting NaN3 and different
concentrations of GLUOX in the buffer but nothing worked.
From: Phillip Huff [mailto:email@example.com]
Sent: woensdag 15 september 2004 18:00
To: Veronique Andriessen
Subject: Re: [Histonet] Glucose oxidase
The glucose oxidase procedure requires that the solution is fresh when
used. We make the solution immediately before we need it, warming it in a
water bath (37C) for 5 minutes before use. We currently do not use Sodium
Azide in our reactions so you could try dropping that reagent and make the
Veronique Andriessen wrote:
I've got a problem. I'm have to do immunostaining with HRP and AP on
inflamed rat pancreas (fresh frozen sections, fixed with acetone ethanol
3:1). I have to quench the endogenous peroxidase in the white blood
I have tried the glucose oxidase block as described in the histonet
archives, but I am not able to get it working.
I have ordered the correct ingredients from Sigma, but nothing! The only
thing that is not recently purchased is the Sodium azide, but I can't
imagine this going bad. I even tried adding 0.1% saponin, but this also
I really need some advice, I'm getting desparate.
Veronique Andriessen BAS
Lab. Molecular Liver Cell Biology
Free University Brussels (VUB), Belgium
GLUCOSE OXIDASE BLOCK FOR ENDOGENOUS PEROXIDASE/PSEUDOPEORXIDASES IN
Reference: Andrew SM, Jasani B. An improved method for the inhibition of
endogenous peroxidase non-deleterious to lymphocyte surface markers.
Application to immunoperoxidase studies on eosinophil-rich tissue
preparations. Histochemical Journal 19:426-30, 1987
All forms of endogenous peroxidase may not be inhibited by the usual
methanol/hydrogen peroxide or buffer/hydrogen peroxide blocking
This method produces nascent hydrogen peroxide that is preferable to the
normal methods using preformed hydrogen peroxide (which you add or buy
your endogenous peroxide blocker). This new method to block 'peroxidatic
activity' is consistently complete. This method is an enzymatic reaction
that produces a slow, steady, very low concentration of hydrogen
It is particularly usefu l for monoclonal antibody staining on frozen
sections that are minimally fixed with acetone.
Glucose (Sigma G 5250) 0.180 g
Glucose oxidase (Sigma G 6641) 0.005 g
Sodium azide 0.0065g
DPBS 50 ml
This procedure has doubled concentration of all reagents used in
1. Incubate sections 1 hour at 37°C waterbath. You do no have to
prewarm buffer mixed with reagents before immersing slides.
2. Rinse in DPBS 3 changes/5 minutes each
3. Proceed with immunostaining
Preweigh and freeze down aliquots of glucose oxidase calculated for 100
working buffer, bring out, and dissolve in DPBS/sodium azide buffer,
immerse slides, incubate, rinse, etc.
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